Defensive publication

ABSTRACT

A CEMENT COMPOSITION IS PROVIDED FOR PVC AND CPVC PIPES WHICH CONTAIN FROM ABOUT 10 TO ABOUT 18 PARTS BY WEIGHT OF PIPE GRADE PVC RESIN OR PIPE GRADE CPVC RESIN, FROM ABOUT 55 TO ABOUT 75 PARTS BY WEIGHT OF TETRAHYDROFURAN, FROM ABOUT 3 TO ABOUT 9 PARTS BY WEIGHT OF A HIGH BOILING SOLVENT, FROM ABOUT 1 TO ABOUT 7 PARTS BY WEIGHT OF A MICRO COLLOIDAL SILICA POWDER AND FROM ABOUT 5 TO ABOUT 25 PARTS BY WEIGHT OF A NONSOLVENT FOR THE PIPE GRADE PVC AND/OR CPVC RESINS.

DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at therequest of the applicant or owner in accordance with the Notice of Dec.16, 1969, 869 0.0. 687. The abstracts of Defensive Publicationapplications are identified by distinctly numbered series and arearranged chronologically. The heading of each abstract indicates thenumber of pages of specification. including claims and sheets ofdrawings contained in the application as originally filed. The files ofthese applications are available to the public for inspection andreproduction may he purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to themerits oi alleged invention. The Patent Oflice makes no assertion as tothe novelty of the disclosed subject matter.

PUBLISHED DECEMBER 4, 1973 T917,005 PIPE CEMENT Everett Walter Knight,Wilmington, Del., assignor to E. I. du Pont de Nemours and Company,Wilmington, Del. Filed Dec. 15, 1972, Ser. No. 315,562 Int. Cl. C08f29/18, 45/04, 45/28 US. Cl. 260-30.4 R No Drawing. 8 Pages SpecificationA cement composition is provided for PVC and CPVC pipes which containfrom about 10 to about 18 parts by weight of pipe grade PVC resin orpipe grade CPVC resin, from about 55 to about 75 parts by weight oftetrahydrofuran, from about 3 to about 9 parts by Weight of a highboiling solvent, from about 1 to about 7 parts by weight of a microcolloidal silica powder and from about 5 to about 25 parts by Weight ofa nonsolvent for the pipe grade PVC and/or CPVC resins.

